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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '78c3ae96c4cf093fa2d98ba24878bd3315c54dcf9a1839b3f0d0c2fce7930f10' 
  AND token = 'pC+ARoXgBNM/K9DA/2Tbexbf3K9JuI9yXodicMI4flY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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