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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5db56ad7a67635acf99bcf022c0d5c6ada67c52977a64f6940a5d73a3b46c70' 
  AND token = 'Qqfjj4p5vEYPGcocajCHcHTBhIyyhc91J/gobe1GdL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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