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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4ed018641abde3fe70176aadf6b1a4867947a82df76dcac9cff5638b9619391d' 
  AND token = 'ZS9npyRdD2jaS7E1eEQ6pCGwysS/wbeClAl6UDRqJRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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