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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f3ce7fde1c58b8a6c1bfefa499c59d138d2f6614c9e979016ed7dd214fbe2b5' 
  AND token = 'THRnDcuHkDKdPnNMiir9yxIt59FmNKoO5yyYFd/d5LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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