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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4aecf7267da0c2c1471ee01e46e6417fc18cbe64a562e3b7935f5c72e6d665d7' 
  AND token = 'Skm9okK4ts+ewl8soKji7sNhHglU7s7fF1GC7744NE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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