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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13320822ca9cd41165819e14b1f7e0f798478e2e9f53ba9b3532c9d54dfaceee' 
  AND token = 'WfCzdX3MaDtHLMJXxac/7OnvBjbVx9TuQsLLVwY7bQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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