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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '08563027d9255cb2a29aae729c14ca0e87e24329af646a8630c767d17c334efe' 
  AND token = 'qQLnI3vbCkP1tjwOmZy74bNxlofRuPEGFQP7qJgiAeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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