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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd2339d3c0549e8341d2254a349ff7fbba11f65695c00969b104ae53693255480' 
  AND token = 't8wbvlIaGoSIRrjlOKvkaVnbJFScZi1na0c8+yMZjAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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