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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '50a147301327cb7dc3e570f4330a05f2c39bbbed474a2cff8ef146ce7a7286ee' 
  AND token = 'KEsC8yM9SKEONYSlQcZ1Fj+taWurC3BSh0h4ADyYiMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}