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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5d3b4f74292e00d44a32ad44187274d81823edbb689eefffeaceecad7983f8f' 
  AND token = '+epWE5XcFa4N4429Fm5lvmmCeo6PgZEday4SdpVjd60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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