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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '144b68720c247b6e93ecb0266347754ee2b410f7ddb207cdd6b98ec732708dd9' 
  AND token = 'KQWnpuTNgQ0WPyms19be05UXU7JCZlwC9i/Lmko4z0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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