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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '484ffc3e25e8640d8434b5487add2f9912dda4c1c6d3fba3a58481b1eb434def' 
  AND token = 'uUUbEW6QVv8Xpx7op7p8wPoRtK+yoWv0/dy8+lFvGF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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