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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30c3ebaca834e071328a87ec6928ed47603e6d03fca8e47b34e256349bcdef44' 
  AND token = '1/GU+5aMu0zMLdgSjb9R14M6S12jcy6P8LLXVp9/Sl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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