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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a4aed27d86ae833bbda3de33eedc8d4189848d8f54c760009daaabb67423563' 
  AND token = '08seJKuyKhfSoXmaeUSVLjI7tC/R9nkV0u64kCepLSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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