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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5ef879e7a3debff913703164eda94f2a6fd10d61c3f8382c3973301b55d1d14' 
  AND token = 'JxiluaR19WNNbMLlRJqdmWJ4X3gQKGUTWnGnus3vldg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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