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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05d8c1587e3fde61a28742bbb1ca3eace60569f36e63a1bc6a8d05260e5e0d70' 
  AND token = '3otG04vSlUPgeqIRmDZ2octCHLtWd4WJaVJuTrTH93M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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