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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a83c61b05c8853df07dd059a216b77ed653678d31accd3ed83c455deb67ef163' 
  AND token = 'qMOYBrsnPeeqDbt7e4CD1FaVtKBkQfpiFQD7igNTR38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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