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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd368666e92cc6b328b26dd0ec9f3a7cd37a3f27a00bd4870939f898256977ddd' 
  AND token = '9OMqbZCY/plcn87/AOxuBJfYcW8E6V1roUaKY77dNsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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