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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '301237b9216d81a1d66360d7a1535afb5a94222229db5510218512889e739d63' 
  AND token = '8NqNnmgOeyjfiVdt2S9pfk4xDyjkjtsSCoOib2Uzk/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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