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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4444f8ac2d5699edf5169664e555735bda12a0c39aad25673d04b273536977cd' 
  AND token = 'zExI2cDfLS0QcK6IkL6TSi1WsPPJnlqSPENm9epUc+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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