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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b59d0c32103880dc590146e9454632ab3f9da024094a4decbe3137c033d698b5' 
  AND token = 'UDQi7utTAi2uOfJ6xSz7xnqNDBciMBZ13pCutCH5OIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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