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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea98d2114771d2147c1a983f19331a09d94ab6e0d3fdc7de510cb00b6f6874e6' 
  AND token = 'XMwbgrXcIfliUGmnYr0onkk+IC8sjFI9gHLcq3yPUGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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