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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '50bfc840b3cd3ec2db837190e1e9f3179da7271c4c5c391d4e5ace70afa88b82' 
  AND token = '95y43NtIk9SPpHPdLjFSZT9iVqbIjHvo4dc+29v1aPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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