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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '17cca2407360ec8c8ee08620fece9c3c5713b5f1334973731ed87999e7064570' 
  AND token = 'yrQux7P5COeZ6/VoTk7Bi4ClyYQCiL9hUE4J0i/XM4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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