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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fec295370bd1564ed17f88043a55c8c4259fa07a5f2ebcf0d142d2157d4d162f' 
  AND token = 'g1Opo/IhXgv2GIlvBOG7bF8aEMcMo1PjmitFhMG9nCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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