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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '52ea3d89deff642d2a26c9ef8297a5c61a82918f55bcd71cc7b19f697e8fef6c' 
  AND token = 'F2D6bt5BEqRY5Zd57XTEMENUQm626rykhDtlhXWgYbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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