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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a540e79db89ee5f6a267dce54a522b482e07cf914e39f565f32f5ab571d63c5a' 
  AND token = 'wmfP8QEsWMmw3UAslPT+wCLFLanlTlf6+bhwy3EGw+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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