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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e813b4308e80816c888d92889db0d4e80236e3fdeb91e24fb19fbef79dd46bd4' 
  AND token = 'm3YAaQ1O6K7QHFe38n/E6J0EiDWU43V464u6Xo2FmBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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