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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ace9e6e988481b599113bc6dce137ad46cc505b567722a9961a0e672cc9da5ea' 
  AND token = 'bI2dfLXTovgPshS6jT9iLxO+bBdThNaak8A/JPMR5d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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