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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7f18be0c3501ffdde68aefbdc3fb6a7c455c20259811afeeea157ff11288f89' 
  AND token = 'J3FYq5Uc6eCUItyecSk9zAdtkPqmDxoFTILzszny8eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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