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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f9f9a5964fc117eee0a614f6f82635d044a79e07115b91434fa75d2b2f66fabb' 
  AND token = 'Ca431Uh6TcrGTQTThZIRUfMLL+qkQod7vmHa0oYw/LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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