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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3e08ee7658f9efd9181ed052a0508f36270bbddfa34c5a7412bbdc508627f62' 
  AND token = 'LM3cgi/Gi2dVLUgzO61HCu7To04be3U1MVrn/4ijMNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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