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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f819ca14ffddf567e4a1eba72fc45441537d5cd396bb7651cf41ecf5eb711d5' 
  AND token = 'EvDqR95vKv9qL4dhHsMtPsnutZNT9oHew1B4g8+F88s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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