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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de773677e7b69c552c56fef0d030ed8171dd87d2b175bfbc97084f2a6dd090b7' 
  AND token = 'djUI2mVCc3yrCOnKfyIoYEW0s6yJvn5EBvrBxg/wIm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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