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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2f50b03d0a98e084c4c0887bf3fce3907f84633a896960402b82c1c8adc5736' 
  AND token = 'MCIRkpm+8rzqsjlegO3Wq0DzBCoyJmxoaH98YgJH0CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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