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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cade3a3a1ce68f23f8f955df948e2c5b7dc18732cd43f7755c1c469c4e0505ca' 
  AND token = 'TNcy8Prngmhh33/Vga7DgSWC13Gs7VjzVa1iTtb0nfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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