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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ffcd00b91cff65cba1d05179ee6f9f98254a72138736d21945c93710ba3ef8a' 
  AND token = '+XxMo5lHaluM1rhTPaIo8DBsH8+3zX94c+NNqF3SCrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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