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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'abb7f8465871be9412c37d2aeb7f12d4a03474e998e61477cb066f0a2fe84cff' 
  AND token = 'LRO3R7CUdQ4TRtNySVINLBRRGrpdBnJXfdzBgIAH0h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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