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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'baa61581f838b563aadf5f4089e3c262c8e130d0cdc82e7ed5d4b3c5991385f9' 
  AND token = 'dC7Ao/Et83HdVgtIS+k73G/rM7LMYs3lit3C0gdRi4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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