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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47fa188f01d058f1e921f4dc9092e01621dfc1a3e99e3b0e8c57b344b8c5fa75' 
  AND token = 'XoKQhO6dl9wfH+xnQaw19rrEEDlOO7DjO3N9fDhpj+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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