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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '933b7e9dac6b51d3d82d17fe10025ae1d42cd54c63bc27ac08f07d8c515edc85' 
  AND token = 'Yhbu2J/jbn9X9geSjXka1SOWyedJYHTmnKsWbeuYT7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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