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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee86a3f694a907000c239c0e934415275d84e8843f0eb108dc6ed332bf2c333c' 
  AND token = '5u8A6Bem/PM7MWshGV8Q8dGJhbgxUEmslh/1ANyVNzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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