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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a000ba3f8113c16ef21ea25cd6c26a22877aaa1709158bc81082ec8829b6402' 
  AND token = 'Y3FYwUarY6k4BGjZ004Zx9l2HSXiGYWsqqMZxXPNmgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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