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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '048bdad19f482d18c9662af7c29d48eb9be8086d8e39b229fd68d47a67884d38' 
  AND token = 'JBU8TKIxTQNj9julsycmZKW9urSmQZ3OyGV6uPsFlQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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