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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd2b18cc2e43ce531fd1ef5f9d4e61f76abefb1ebd02c9c9f9054da1f7db4c31f' 
  AND token = 'OLV45BHbRGCXUEkL4n0JfliWm3k2LGP1taZYZJSXJY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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