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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '54a2e1badfcb60ce695136edb086f45bd64c805ab921de27cb1a033cbae393ed' 
  AND token = '7SNbIfaflX0hiXm/jLvKg6ivhybtfZHz2wuXTNfIM3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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