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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ea28e3a6edd91a6f92d223d40831087e959c8e2d34daf7aa1aaa0dee652dd1a' 
  AND token = 'iIV4coFbeVnOEiw7mOf80jQyMCUNUq6zMuZ8rq5tmGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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