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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca30f4801eecca944b2cd788bc94fccec1064864dd87bb6a8474e27d5db8796a' 
  AND token = 'ePi173MtTCw7xHvhOhsW/iwxC6dGSlGloVE77T7pXq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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