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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '788f57e5c447bae299ad2c894fc32071492d461cec9d7e72f5501f0e4201bc15' 
  AND token = 'CIM3Uu3spgdgmpcfsn5gymDE5Y8fG2VqmEYpgllZBUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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