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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f0fe90342648693829f89d10790db7c90568587dd52ff9f841291effc4330f7' 
  AND token = '0F5I7yO1thqjo58EFtTjtbP3gGrIIiceCMr6CxdTa68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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