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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5328c8398349786ee55896e246c7d8d5e31c94a8be8f46a778629a27b2edc3f1' 
  AND token = 'bVmABC5lhfq/wrkzhGCJkOh5bOw0mW1Cr5nY4y6M60k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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