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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ac455ddd924e5b2c094e9d342b02368e833bf178ca2b1b16fc5adff8c1e57a4' 
  AND token = 'sq3aFnDS+fhRMCfuuqpiSIi2Fje5Ie91FR8Kr3craDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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