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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '59ce11dc9beb60cc9ed4b58bd417bf3a4fd910fadd51e15ee33f35ee82407b8c' 
  AND token = 'aBwXweeg8uWKZqkXjse1OBXi8I8fzV1PhU7jG4W6Q9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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