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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b1241b276f9ac14416355c4fc5aeded05c9845b79918f062a7a9adea78eee6d3' 
  AND token = 'cqsLeD0/3aEDW+L7LV/fMh6uhvaTUUJHSJT7Xb4u8rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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