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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eeada94fcc79e2ee48aa6649930da645141123e7c649b62be06b95a13bf58c00' 
  AND token = 'rg7kzjJu1MSU0/wupWBM2ay1weZdSe9qkw5gy1hdwaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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