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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ca9c8c8f20398873368e9d5911ca2397e1d0b18e615026c10e4d38e2539beb7d' 
  AND token = '0Bnemhj3+zWXv3YZQqyx708mI6FkdM38e5DBee28luQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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