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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c72973d034ba612ce4e4aa64feb2ba9a49535707b2c767e4408c0855e327576' 
  AND token = '8M7mbXU6HRsEVYoToIVAvQpdBf2+tjvaoLlPNqMZBs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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